CoordsysNode.cc 16.4 KB
Newer Older
Jan Möbius's avatar
 
Jan Möbius committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
//=============================================================================
//
//                               OpenFlipper
//        Copyright (C) 2008 by Computer Graphics Group, RWTH Aachen
//                           www.openflipper.org
//
//-----------------------------------------------------------------------------
//
//                                License
//
//  OpenFlipper is free software: you can redistribute it and/or modify
//  it under the terms of the GNU Lesser General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  (at your option) any later version.
//
//  OpenFlipper is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public License
//  along with OpenFlipper.  If not, see <http://www.gnu.org/licenses/>.
//
//-----------------------------------------------------------------------------
//
Jan Möbius's avatar
Jan Möbius committed
26 27 28
//   $Revision$
//   $Author$
//   $Date$
Jan Möbius's avatar
 
Jan Möbius committed
29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59
//
//=============================================================================




//=============================================================================
//
//  CLASS CoordsysNode - IMPLEMENTATION
//
//=============================================================================

//== INCLUDES =================================================================

#include "CoordsysNode.hh"
#include "../GL/gl.hh"
#include <iostream>
#include <math.h>


//== NAMESPACES ===============================================================

namespace ACG {
namespace SceneGraph {


//== IMPLEMENTATION ==========================================================


void
CoordsysNode::
60
boundingBox(Vec3f& /*_bbMin*/, Vec3f& /*_bbMax*/)
Jan Möbius's avatar
 
Jan Möbius committed
61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101
{
	//_bbMin.minimize( Vect3f  )
}


//----------------------------------------------------------------------------


unsigned int
CoordsysNode::
availableDrawModes() const
{
  return ( DrawModes::POINTS |
	        DrawModes::POINTS_SHADED |
	        DrawModes::POINTS_COLORED );
}


//----------------------------------------------------------------------------

void
CoordsysNode::
drawCoordsys( GLState&  _state) {

  double topRadius = 0.01;
  double arrowLength = 0.04;
  double bodyRadius = 0.004;
  double bodyLength = 0.06;
  int slices = 10;
  int stacks = 10;
  int loops = 10;
  double sphereRadius = 0.01;

  GLUquadricObj *quadric = gluNewQuadric();

  // Origin
  glColor3f(0.5, 0.5, 0.5);
  gluSphere( quadric, sphereRadius, slices, stacks );

  // X-Axis
  glColor3f(1.0, 0.0, 0.0);
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
102 103 104
  _state.push_modelview_matrix ();
  _state.rotate (-90, 0, 1, 0);
  _state.translate ( 0, 0, -bodyLength );
Jan Möbius's avatar
 
Jan Möbius committed
105 106
  gluCylinder( quadric, bodyRadius, bodyRadius, bodyLength, slices, stacks );
  gluDisk( quadric, 0, topRadius, slices, loops );
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
107
  _state.translate ( 0, 0, -arrowLength );
Jan Möbius's avatar
 
Jan Möbius committed
108
  gluCylinder( quadric, 0, topRadius, arrowLength, slices, stacks );
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
109
  _state.pop_modelview_matrix ();
Jan Möbius's avatar
 
Jan Möbius committed
110 111 112

  // Y-Axis
  glColor3f(0.0, 1.0, 0.0);
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
113 114 115
  _state.push_modelview_matrix ();
  _state.rotate (90, 1, 0, 0);
  _state.translate ( 0, 0, -bodyLength );
Jan Möbius's avatar
 
Jan Möbius committed
116 117
  gluCylinder( quadric, bodyRadius, bodyRadius, bodyLength, slices, stacks );
  gluDisk( quadric, 0, topRadius, slices, loops );
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
118
  _state.translate ( 0, 0, -arrowLength );
Jan Möbius's avatar
 
Jan Möbius committed
119
  gluCylinder( quadric, 0, topRadius, arrowLength, slices, stacks );
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
120
  _state.pop_modelview_matrix ();
Jan Möbius's avatar
 
Jan Möbius committed
121 122 123

  // Z-Axis
  glColor3f(0.0, 0.0, 1.0);
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
124 125 126
  _state.push_modelview_matrix ();
  _state.rotate (180, 0, 1, 0);
  _state.translate ( 0, 0, -bodyLength );
Jan Möbius's avatar
 
Jan Möbius committed
127 128
  gluCylinder( quadric, bodyRadius, bodyRadius, bodyLength, slices, stacks );
  gluDisk( quadric, 0, topRadius, slices, loops );
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
129
  _state.translate ( 0, 0, -arrowLength );
Jan Möbius's avatar
 
Jan Möbius committed
130
  gluCylinder( quadric, 0, topRadius, arrowLength, slices, stacks );
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
131
  _state.pop_modelview_matrix ();
Jan Möbius's avatar
 
Jan Möbius committed
132 133 134 135 136 137 138 139 140

  gluDeleteQuadric(quadric);
}

//============================================================================

void
CoordsysNode::drawCoordsysPick( GLState&  _state) {

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
141 142 143 144 145 146 147 148
  double topRadius = 0.01;
  double arrowLength = 0.04;
  double bodyRadius = 0.004;
  double bodyLength = 0.06;
  int slices = 10;
  int stacks = 10;
  int loops = 10;
  double sphereRadius = 0.01;
Jan Möbius's avatar
 
Jan Möbius committed
149

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
150
  GLUquadricObj *quadric = gluNewQuadric();
Jan Möbius's avatar
 
Jan Möbius committed
151 152

  // Origin
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
153 154
  _state.pick_set_name (1);
  gluSphere( quadric, sphereRadius, slices, stacks );
Jan Möbius's avatar
 
Jan Möbius committed
155 156

  // X-Axis
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
157 158 159 160 161 162 163 164 165
  _state.pick_set_name (2);
  _state.push_modelview_matrix ();
  _state.rotate (-90, 0, 1, 0);
  _state.translate ( 0, 0, -bodyLength );
  gluCylinder( quadric, bodyRadius, bodyRadius, bodyLength, slices, stacks );
  gluDisk( quadric, 0, topRadius, slices, loops );
  _state.translate ( 0, 0, -arrowLength );
  gluCylinder( quadric, 0, topRadius, arrowLength, slices, stacks );
  _state.pop_modelview_matrix ();
Jan Möbius's avatar
 
Jan Möbius committed
166 167

  // Y-Axis
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
168 169 170 171 172 173 174 175 176
  _state.pick_set_name (3);
  _state.push_modelview_matrix ();
  _state.rotate (90, 1, 0, 0);
  _state.translate ( 0, 0, -bodyLength );
  gluCylinder( quadric, bodyRadius, bodyRadius, bodyLength, slices, stacks );
  gluDisk( quadric, 0, topRadius, slices, loops );
  _state.translate ( 0, 0, -arrowLength );
  gluCylinder( quadric, 0, topRadius, arrowLength, slices, stacks );
  _state.pop_modelview_matrix ();
Jan Möbius's avatar
 
Jan Möbius committed
177 178

  // Z-Axis
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
179 180 181 182 183 184 185 186 187 188 189 190
  _state.pick_set_name (4);
  _state.push_modelview_matrix ();
  _state.rotate (180, 0, 1, 0);
  _state.translate ( 0, 0, -bodyLength );
  gluCylinder( quadric, bodyRadius, bodyRadius, bodyLength, slices, stacks );
  gluDisk( quadric, 0, topRadius, slices, loops );
  _state.translate ( 0, 0, -arrowLength );
  gluCylinder( quadric, 0, topRadius, arrowLength, slices, stacks );
  _state.pop_modelview_matrix ();


  gluDeleteQuadric(quadric);
Jan Möbius's avatar
 
Jan Möbius committed
191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215

}


//============================================================================


void
CoordsysNode::
draw(GLState&  _state  , unsigned int /*_drawMode*/)
{
  // Push Modelview-Matrix
  _state.push_modelview_matrix();

  Vec4f lastBaseColor = _state.base_color();

  glPushAttrib( GL_LIGHTING_BIT ); // STACK_ATTRIBUTES <- LIGHTING_ATTRIBUTE
  glEnable(GL_LIGHTING);
  glColorMaterial ( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE ) ;
  glEnable(GL_COLOR_MATERIAL);
  glShadeModel(GL_SMOOTH);

  // Init state - changes when mode_ != POSITION
  Vec3d pos3D(0.0,0.0,0.0);

216 217 218
  GLint stencil = 0;
  glGetIntegerv(GL_STENCIL_BITS,   &stencil);

Jan Möbius's avatar
 
Jan Möbius committed
219 220 221 222 223 224 225
  if ( mode_ == SCREENPOS ) {

    int left, bottom, width, height;
    _state.get_viewport(left, bottom, width, height);

    // Projection reset
    _state.push_projection_matrix();
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
226 227
    _state.reset_projection();
    _state.perspective(45.0, _state.aspect(), 0.8, 20.0);
Jan Möbius's avatar
 
Jan Möbius committed
228 229 230 231 232 233

    float posx = left + width - 30.0 ;
    float posy = bottom + height - 30.0 ;

    Vec3d screenposCenterPoint( posx , posy , 0.0);

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
234 235
    _state.push_modelview_matrix();
    _state.reset_modelview();
Jan Möbius's avatar
 
Jan Möbius committed
236

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
237 238
    pos3D = _state.unproject (Vec3d (posx, posy, 0.5));
    _state.pop_modelview_matrix();
Jan Möbius's avatar
 
Jan Möbius committed
239

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
240 241
    // reset scene translation
    GLMatrixd modelview = _state.modelview();
Jan Möbius's avatar
 
Jan Möbius committed
242

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
243 244 245
    modelview(0,3) = 0.0;
    modelview(1,3) = 0.0;
    modelview(2,3) = 0.0;
Jan Möbius's avatar
 
Jan Möbius committed
246

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
247 248
    _state.set_modelview (modelview);
    _state.translate (pos3D[0], pos3D[1], pos3D[2]-0.3, MULT_FROM_LEFT);
Jan Möbius's avatar
 
Jan Möbius committed
249

250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267
    if (stencil > 0)
    {
      glEnable (GL_STENCIL_TEST);
      // clear stencil buffer in desired area
      glStencilOp (GL_ZERO, GL_KEEP, GL_KEEP);
      glStencilFunc (GL_NEVER, 0, ~0);
      drawClearArea(_state, false, GLMatrixd ());

      // fill stencil with values
      glStencilOp (GL_REPLACE, GL_REPLACE, GL_REPLACE);
      glStencilFunc (GL_NEVER, 1, ~0);
      drawCoordsys(_state);

      // draw only to regions that have been marked
      glStencilOp (GL_KEEP, GL_KEEP, GL_KEEP);
      glStencilFunc (GL_EQUAL, 1, ~0);
    }

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
268
    // clear depth buffer behind coordsys node
269
    drawClearArea(_state, false, GLMatrixd (), 1.0);
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
270

Jan Möbius's avatar
 
Jan Möbius committed
271 272 273
    // Koordinatensystem zeichnen
    drawCoordsys(_state);

274 275 276 277 278 279
    // make sure nothing can paint above coordsys node
    drawClearArea(_state, false, GLMatrixd (), 0.0);

    if (stencil > 0)
      glDisable (GL_STENCIL_TEST);

Jan Möbius's avatar
 
Jan Möbius committed
280 281
    // Projection reload
    _state.pop_projection_matrix();
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
282

Jan Möbius's avatar
 
Jan Möbius committed
283 284 285

  } else if (mode_ == POSITION) { /* mode_ == POSITION */

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
286 287 288 289 290 291 292
    GLMatrixd modelview = _state.modelview();

    modelview(0,3) = 0.0;
    modelview(1,3) = 0.0;
    modelview(2,3) = 0.0;

    _state.set_modelview (modelview);
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
293

294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311
    if (stencil > 0)
    {
      glEnable (GL_STENCIL_TEST);
      // clear stencil buffer in desired area
      glStencilOp (GL_ZERO, GL_KEEP, GL_KEEP);
      glStencilFunc (GL_NEVER, 0, ~0);
      drawClearArea(_state, false, GLMatrixd ());

      // fill stencil with values
      glStencilOp (GL_REPLACE, GL_REPLACE, GL_REPLACE);
      glStencilFunc (GL_NEVER, 1, ~0);
      drawCoordsys(_state);

      // draw only to regions that have been marked
      glStencilOp (GL_KEEP, GL_KEEP, GL_KEEP);
      glStencilFunc (GL_EQUAL, 1, ~0);
    }

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
312
    // clear depth buffer behind coordsys node
313
    drawClearArea(_state, false, GLMatrixd (), 1.0);
Jan Möbius's avatar
 
Jan Möbius committed
314 315
    drawCoordsys(_state);

316 317 318 319 320 321
    // make sure nothing can paint above coordsys node
    drawClearArea(_state, false, GLMatrixd (), 0.0);

    if (stencil > 0)
      glDisable (GL_STENCIL_TEST);

Jan Möbius's avatar
 
Jan Möbius committed
322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356
  }

  glPopAttrib();

  glColor4fv(lastBaseColor.data());

  // Reload old configuration
  _state.pop_modelview_matrix();
}


void
CoordsysNode::
setMode(const CoordsysMode _mode)
{
  mode_ = _mode;
}

void
CoordsysNode::
setPosition(const Vec3f& _pos)
{
  pos3f_ = _pos;
}

CoordsysNode::CoordsysMode
CoordsysNode::
getMode() const
{
  return mode_;
}

void
CoordsysNode::pick(GLState& _state, PickTarget _target)
{
Jan Möbius's avatar
Jan Möbius committed
357 358
  if (_target == PICK_ANYTHING) {

Jan Möbius's avatar
Jan Möbius committed
359 360
    GLdouble mat[16];

Jan Möbius's avatar
 
Jan Möbius committed
361
    // Push Modelview-Matrix
Jan Möbius's avatar
Jan Möbius committed
362
    _state.push_modelview_matrix();
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
363
    _state.pick_set_maximum (5);
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
364
    _state.pick_set_name (0);
Jan Möbius's avatar
 
Jan Möbius committed
365 366

    // Init state - changes when mode_ != POSITION
Jan Möbius's avatar
Jan Möbius committed
367
    Vec3d pos3D(0.0,0.0,0.0);
Jan Möbius's avatar
 
Jan Möbius committed
368

Jan Möbius's avatar
Jan Möbius committed
369
    if ( mode_ == SCREENPOS ) {
Jan Möbius's avatar
 
Jan Möbius committed
370

Jan Möbius's avatar
Jan Möbius committed
371
      
Jan Möbius's avatar
Jan Möbius committed
372 373
      int left, bottom, width, height;
      _state.get_viewport(left, bottom, width, height);
Jan Möbius's avatar
 
Jan Möbius committed
374

Jan Möbius's avatar
Jan Möbius committed
375 376
      // Projection reset
      _state.push_projection_matrix();
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
377 378
      _state.reset_projection();
      _state.perspective(45.0, _state.aspect(), 0.8, 20.0);
Jan Möbius's avatar
 
Jan Möbius committed
379

Jan Möbius's avatar
Jan Möbius committed
380 381
      float posx = left + width - 30.0 ;
      float posy = bottom + height - 30.0 ;
Jan Möbius's avatar
 
Jan Möbius committed
382

Jan Möbius's avatar
Jan Möbius committed
383
      Vec3d screenposCenterPoint( posx , posy , 0.0);
Jan Möbius's avatar
 
Jan Möbius committed
384

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
385 386
      _state.push_modelview_matrix();
      _state.reset_modelview();
Jan Möbius's avatar
 
Jan Möbius committed
387

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
388 389
      pos3D = _state.unproject (Vec3d (posx, posy, 0.5));
      _state.pop_modelview_matrix();
Jan Möbius's avatar
 
Jan Möbius committed
390

Jan Möbius's avatar
Jan Möbius committed
391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408
      // Projection reload
      _state.pop_projection_matrix();

      // the only way to get the gl pick matrix again
      glMatrixMode(GL_PROJECTION);

      glPushMatrix ();
      glMultMatrixd( _state.inverse_projection().get_raw_data());

      glGetDoublev(GL_PROJECTION_MATRIX, mat);

      GLMatrixd pickMat (mat);

      // add our matrix
      gluPerspective(45.0, _state.aspect(), 0.8, 20.0);

      glMatrixMode(GL_MODELVIEW);

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
409 410
      // reset scene translation
      GLMatrixd modelview = _state.modelview();
Jan Möbius's avatar
 
Jan Möbius committed
411

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
412 413 414
      modelview(0,3) = 0.0;
      modelview(1,3) = 0.0;
      modelview(2,3) = 0.0;
Jan Möbius's avatar
 
Jan Möbius committed
415

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
416 417
      _state.set_modelview (modelview);
      _state.translate (pos3D[0], pos3D[1], pos3D[2]-0.3, MULT_FROM_LEFT);
Jan Möbius's avatar
 
Jan Möbius committed
418

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
419
      // clear depth buffer behind coordsys node
Jan Möbius's avatar
Jan Möbius committed
420
      drawClearArea(_state, true, pickMat);
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
421

Jan Möbius's avatar
Jan Möbius committed
422 423 424
      // Koordinatensystem zeichnen
      drawCoordsysPick(_state);

Jan Möbius's avatar
Jan Möbius committed
425 426 427
      glMatrixMode(GL_PROJECTION);
      glPopMatrix ();
      glMatrixMode(GL_MODELVIEW);
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
428

Jan Möbius's avatar
Jan Möbius committed
429 430
    } else if (mode_ == POSITION) { /* mode_ == POSITION */

Jan Möbius's avatar
Jan Möbius committed
431 432 433 434 435 436 437 438 439 440 441 442 443
      glMatrixMode(GL_PROJECTION);

      glPushMatrix ();
      glMultMatrixd( _state.inverse_projection().get_raw_data());

      glGetDoublev(GL_PROJECTION_MATRIX, mat);

      glPopMatrix ();

      GLMatrixd pickMat (mat);

      glMatrixMode(GL_MODELVIEW);

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
444 445 446 447 448 449
      GLMatrixd modelview = _state.modelview();

      modelview(0,3) = 0.0;
      modelview(1,3) = 0.0;
      modelview(2,3) = 0.0;

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
450
      // clear depth buffer behind coordsys node
Jan Möbius's avatar
Jan Möbius committed
451
      drawClearArea(_state, true, pickMat);
Jan Möbius's avatar
Jan Möbius committed
452
      drawCoordsysPick(_state);
Jan Möbius's avatar
 
Jan Möbius committed
453
    }
Jan Möbius's avatar
Jan Möbius committed
454 455 456 457
    // Reload old configuration
    _state.pop_modelview_matrix();

  }
Jan Möbius's avatar
 
Jan Möbius committed
458 459
}

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
460 461
//----------------------------------------------------------------------------

462
void CoordsysNode::drawClearArea(GLState&  _state, bool _pick, GLMatrixd _pickMatrix, GLfloat z)
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491
{
  std::vector<Vec2f> points;
  Vec2f center;
  float radius;

  int left, bottom, width, height;
  _state.get_viewport(left, bottom, width, height);

  GLUquadricObj *quadric = gluNewQuadric();

  // respect sphere radius
  Vec3d proj = _state.project (Vec3d (-0.01, -0.01, -0.01));
  points.push_back (Vec2f (proj[0], proj[1]));

  proj = _state.project (Vec3d (0.1, 0.0, 0.0));
  points.push_back (Vec2f (proj[0], proj[1]));

  proj = _state.project (Vec3d (0.0, 0.1, 0.0));
  points.push_back (Vec2f (proj[0], proj[1]));

  proj = _state.project (Vec3d (0.0, 0.0, 0.1));
  points.push_back (Vec2f (proj[0], proj[1]));


  // get bounding circle of projected 4 points of the coord node
  boundingCircle(points, center, radius);

  _state.push_projection_matrix();
  _state.reset_projection();
Jan Möbius's avatar
Jan Möbius committed
492 493 494 495 496 497 498 499 500
  if (_pick)
  {
    glMatrixMode(GL_PROJECTION);
    glPushMatrix ();
    glMultMatrixd(_pickMatrix.get_raw_data());

    glMatrixMode(GL_MODELVIEW);
  }

Jan Möbius's avatar
Dennis:  
Jan Möbius committed
501 502 503 504 505
  _state.ortho (left, left + width, bottom, bottom + height, 0.0, 1.0);

  _state.push_modelview_matrix();
  _state.reset_modelview();
  glDepthFunc (GL_ALWAYS);
506
  _state.translate (center[0], center[1], -z);
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
507 508 509 510 511 512 513 514 515 516 517 518 519 520 521

  if (_pick)
    _state.pick_set_name (0);
  else
    glColorMask(false, false, false, false);

  // 10% more to ensure everything is in
  gluDisk( quadric, 0, radius * 1.1, 10, 10 );

  glDepthFunc (GL_LESS);
  _state.pop_modelview_matrix();
  _state.pop_projection_matrix();

  if (!_pick)
    glColorMask(true, true, true, true);
Jan Möbius's avatar
Jan Möbius committed
522 523 524 525 526 527
  else
  {
    glMatrixMode(GL_PROJECTION);
    glPopMatrix ();
    glMatrixMode(GL_MODELVIEW);
  }
Jan Möbius's avatar
Dennis:  
Jan Möbius committed
528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626

  gluDeleteQuadric(quadric);
}

//----------------------------------------------------------------------------

void CoordsysNode::boundingCircle(std::vector<Vec2f> &_in, Vec2f &_center, float &_radius)
{
  if (_in.size () == 0)
    return;
  if (_in.size () < 2)
  {
    _center = _in[0];
    _radius = 0.0f;
    return;
  }
  bool found = false;

  // try all circumcircles of all possible lines
  for (unsigned int i = 0; i < _in.size () - 1; i++)
    for (unsigned int j = i + 1; j < _in.size (); j++)
    {
      Vec2f cen = (_in[i] + _in[j]) * 0.5;
      float rad = (_in[i] - cen).length ();
      bool allin = true;

      for (unsigned int k = 0; k < _in.size (); k++)
        if (k != i && k != j && (_in[k] - cen).length () > rad)
        {
          allin = false;
          break;
        }

      if (!allin)
        continue;

      if (found)
      {
        if (rad < _radius)
        {
          _center = cen;
          _radius = rad;
        }
      }
      else
      {
        found = true;
        _center = cen;
        _radius = rad;
      }
    }

  if (found)
    return;

  // try all circumcircles of all possible triangles
  for (unsigned int i = 0; i < _in.size () - 2; i++)
    for (unsigned int j = i + 1; j < _in.size () - 1; j++)
      for (unsigned int k = j + 1; k < _in.size (); k++)
      {
        float v = ((_in[k][0]-_in[j][0])*((_in[i][0]*_in[i][0])+(_in[i][1]*_in[i][1]))) +
                  ((_in[i][0]-_in[k][0])*((_in[j][0]*_in[j][0])+(_in[j][1]*_in[j][1]))) +
                  ((_in[j][0]-_in[i][0])*((_in[k][0]*_in[k][0])+(_in[k][1]*_in[k][1])));
        float u = ((_in[j][1]-_in[k][1])*((_in[i][0]*_in[i][0])+(_in[i][1]*_in[i][1]))) +
                  ((_in[k][1]-_in[i][1])*((_in[j][0]*_in[j][0])+(_in[j][1]*_in[j][1]))) +
                  ((_in[i][1]-_in[j][1])*((_in[k][0]*_in[k][0])+(_in[k][1]*_in[k][1])));
        float d = (_in[i][0]*_in[j][1])+(_in[j][0]*_in[k][1])+(_in[k][0]*_in[i][1]) -
                  (_in[i][0]*_in[k][1])-(_in[j][0]*_in[i][1])-(_in[k][0]*_in[j][1]);
        Vec2f cen(0.5 * (u/d), 0.5 * (v/d));
        float rad = (_in[i] - cen).length ();
        bool allin = true;

        for (unsigned int l = 0; l < _in.size (); l++)
          if (l != i && l != j && l != k && (_in[l] - cen).length () > rad)
          {
            allin = false;
            break;
          }

        if (!allin)
          continue;

        if (found)
        {
          if (rad < _radius)
          {
            _center = cen;
            _radius = rad;
          }
        }
        else
        {
          found = true;
          _center = cen;
          _radius = rad;
        }
      }
}

Jan Möbius's avatar
 
Jan Möbius committed
627 628 629 630
//=============================================================================
} // namespace SceneGraph
} // namespace ACG
//=============================================================================